pueplichhuisen electrical components, Germany pueplichhuisen models, pueplichhuisen prices

pueplichhuisen electrical components are resistive devices with nonlinear voltage-current characteristics, primarily used for voltage clamping when circuits experience overvoltage, absorbing excess current to protect sensitive components. The resistive body material of varistors is semiconductor, making them a type of semiconductor resistor. The widely used "zinc oxide" varistor has a main body composed of divalent zinc and hexavalent oxygen. Therefore, from a materials perspective, zinc oxide varistors are a type of "II-VI group oxide semiconductor." In Taiwan, China, varistors are called "surge absorbers," sometimes also referred to as "electric shock (surge) suppressors (absorbers)." Varistors are voltage-limiting protection devices. Utilizing the nonlinear characteristics of varistors, when overvoltage appears across the two poles of a varistor, it can clamp the voltage to a relatively fixed value, thereby protecting downstream circuits. Main parameters of varistors include: varistor voltage, current handling capacity, junction capacitance, response time, etc. The response time of varistors is in the ns range, faster than gas discharge tubes, but slightly slower than TVS tubes. Generally, their response speed meets the requirements for overvoltage protection in electronic circuits. The junction capacitance of varistors is typically in the range of hundreds to thousands of Pf, making them unsuitable for direct application in high-frequency signal line protection in many cases. When applied in AC circuit protection, their larger junction capacitance increases leakage current, which must be fully considered in protection circuit design. Varistors have a large current handling capacity, but smaller than that of gas discharge tubes. Varistors, abbreviated as VDR, are voltage-sensitive nonlinear overvoltage protection semiconductor components.

pueplichhuisen electrical component features

Solid-state relays are contactless electronic switches with isolation functions. They have no mechanical contact parts during switching. Therefore, in addition to having the same functions as electromagnetic relays, solid-state relays offer logic circuit compatibility, vibration and mechanical shock resistance, unrestricted installation positions, good moisture, mold, and corrosion resistance, excellent performance in explosion-proofing and ozone pollution prevention, low input power, high sensitivity, low control power, good electromagnetic compatibility, low noise, and high operating frequency. Solid-state relays have no internal mechanical parts and adopt a potting full-seal structure, providing advantages such as vibration resistance, corrosion resistance, long life, and high reliability. AC solid-state relays use zero-crossing triggering technology, resulting in short switching times, suitable for higher frequency applications. Optical isolation is used between input and output circuits, resulting in very low input power consumption. The output end has protection circuits and strong load capacity.

pueplichhuisen electrical component classification

1, fuse resistors: Also known as fusible resistors, they serve the dual function of a resistor and a fuse under normal conditions. When a circuit fault causes power to exceed the rated power, they blow like a fuse to disconnect the circuit. Fuse resistors generally have low resistance values and low power ratings. 9, sensitive resistors: These refer to resistors whose resistance values are sensitive to certain physical quantities (such as temperature, humidity, light, voltage, mechanical force, and gas concentration). When these physical quantities change, the resistance of sensitive resistors changes accordingly, presenting different resistance values. Based on sensitivity to different physical quantities, sensitive resistors can be classified into thermistors, humidity-sensitive resistors, photoresistors, varistors, force-sensitive resistors, magnetoresistors, and gas-sensitive resistors. The materials used for sensitive resistors are almost all semiconductors, so these resistors are also called semiconductor resistors. The resistance of thermistors changes with temperature; those whose resistance decreases as temperature rises are negative temperature coefficient (NTC) thermistors. NTC thermistors are widely used and can be further divided into general-purpose NTC thermistors, voltage-stabilizing NTC thermistors, and temperature-measuring NTC thermistors. Photoresistors change their resistance value according to the intensity of incident light; when incident light increases, the resistance of the photoresistor decreases, and when incident light weakens, the resistance value increases.

pueplichhuisen electrical component principles

Schottky diodes are metal-semiconductor devices made using noble metals (gold, silver, aluminum, platinum, etc.) A as the anode and N-type semiconductor B as the cathode, utilizing the rectifying characteristics of the barrier formed at their contact surface. Because N-type semiconductors contain a large number of electrons, while noble metals have only a very small number of free electrons, electrons diffuse from the high-concentration B to the low-concentration A. Clearly, there are no holes in the metal A, so there is no hole diffusion movement from A to B. As electrons continuously diffuse from B to A, the electron concentration on the surface of B gradually decreases, disrupting surface electrical neutrality and forming a barrier. The electric field direction is B → A. However, under the influence of this electric field, electrons in A also undergo drift motion from A → B, weakening the electric field formed by diffusion. When a space charge region of a certain width is established, the electron drift motion caused by the electric field and the electron diffusion motion caused by the concentration difference reach a relative balance, forming the Schottky barrier. The internal circuit structure of a typical Schottky rectifier uses N-type semiconductor as the substrate, on which an N-epitaxial layer doped with arsenic is formed. The anode uses materials such as molybdenum or aluminum to form a barrier layer. Silicon dioxide is used to eliminate the electric field in the edge region, increasing the withstand voltage of the device. The N-type substrate has a very small on-state resistance, and its doping concentration is 101% times higher than that of the H-layer. An N+ cathode layer is formed beneath the substrate to reduce cathode contact resistance. By adjusting structural parameters, a Schottky barrier is formed between the N-type substrate and the anode metal.

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